Static "Hello world" page

fastcgi_conn.cpp

@@ -1,8 +1,11 @@
 #include <arpa/inet.h>
 #include <netinet/in.h>
+#include <sys/uio.h>
 
 #include "fastcgi_conn.h"
 
+#include "fastcgi_request.h"
+
 namespace {
 
 struct fcgi_header {
@@ -12,16 +15,39 @@ struct fcgi_header {
 	uint16_t request_id_; // network byte order
 	uint16_t content_length_; // network byte order
   public:
-	uint8_t padding_length;
-	uint8_t reserved;
+	uint8_t padding_length = 0;
+	uint8_t reserved = 0;
 
-	uint16_t ContentLength() const { return htons(content_length_); }
+	uint16_t RequestId() const { return ntohs(request_id_); }
+	uint16_t ContentLength() const { return ntohs(content_length_); }
+
+	void SetRequestId(uint16_t request_id) { request_id_ = htons(request_id); }
+	void SetContentLength(uint16_t content_length) { content_length_ = htons(content_length); }
 };
 
 struct fcgi_begin_request {
-	uint16_t role; // network byte order
+  private:
+	uint16_t role_; // network byte order
+  public:
 	uint8_t flags;
 	uint8_t reserved[5];
+
+	uint16_t Role() const { return ntohs(role_); }
+};
+
+struct fcgi_end_request {
+  private:
+	uint32_t app_status_;
+  public:
+	uint8_t protocol_status;
+	uint8_t reserved[3] = {};
+
+	void SetAppStatus(uint32_t app_status) { app_status_ = htonl(app_status); }
+};
+
+struct fcgi_param_header {
+	uint8_t key_length;
+	uint8_t value_length;
 };
 
 constexpr auto fcgi_max_content_len = 65535;
@@ -30,8 +56,9 @@ constexpr auto fcgi_max_record_len = sizeof(fcgi_header) + fcgi_max_content_len
 
 } // namespace
 
-FastCGIConn::FastCGIConn(int sock, const sockaddr_in6& client_addr)
+FastCGIConn::FastCGIConn(int sock, const sockaddr_in6& client_addr, const std::function<void(std::unique_ptr<FastCGIRequest>)>& callback)
 		: sock_(sock),
+		  callback_(callback),
 		  buf_(fcgi_max_record_len) {
 	char client_addr_str[INET6_ADDRSTRLEN];
 	PCHECK(inet_ntop(AF_INET6, &client_addr.sin6_addr, client_addr_str, sizeof(client_addr_str)));
@@ -50,6 +77,8 @@ void FastCGIConn::Serve() {
 		PCHECK(read_len >= 0);
 		if (read_len == 0) {
 			LOG(INFO) << "peer closed connection";
+			delete this;
+			return;
 		}
 		buf_.Wrote(read_len);
 
@@ -58,6 +87,47 @@ void FastCGIConn::Serve() {
 	}
 }
 
+void FastCGIConn::WriteBlock(uint8_t type, uint16_t request_id, const std::vector<iovec>& vecs) {
+	std::vector<iovec> out_vecs;
+	out_vecs.reserve(vecs.size() + 1);
+
+	fcgi_header header;
+	header.version = 1;
+	header.type = type;
+	header.SetRequestId(request_id);
+	uint16_t content_length = 0;
+	for (auto& vec : vecs) {
+		content_length += vec.iov_len;
+	}
+	header.SetContentLength(content_length);
+	out_vecs.push_back(std::move(iovec{
+		.iov_base = &header,
+		.iov_len = sizeof(header),
+	}));
+
+	for (auto& vec : vecs) {
+		out_vecs.push_back(vec);
+	}
+
+	CHECK_EQ(writev(sock_, out_vecs.data(), out_vecs.size()), content_length + sizeof(header));
+}
+
+void FastCGIConn::WriteOutput(uint16_t request_id, const std::vector<iovec>& vecs) {
+	WriteBlock(6, request_id, vecs);
+}
+
+void FastCGIConn::WriteEnd(uint16_t request_id, uint8_t status) {
+	fcgi_end_request end;
+	end.SetAppStatus(status);
+
+	std::vector<iovec> vecs;
+	vecs.push_back(std::move(iovec{
+		.iov_base = &end,
+		.iov_len = sizeof(end),
+	}));
+	WriteBlock(3, request_id, vecs);
+}
+
 void FastCGIConn::ParseBuf() {
 	buf_.ResetRead();
 
@@ -72,22 +142,39 @@ void FastCGIConn::ParseBuf() {
 			return;
 		}
 
-		LOG(INFO) << "type: " << (int)header->type;
-
 		switch (header->type) {
 		  case 1:
 		  	{
 				CHECK_EQ(header->ContentLength(), sizeof(fcgi_begin_request));
 				const auto *begin_request = CHECK_NOTNULL(buf_.ReadObj<fcgi_begin_request>());
-				CHECK_EQ(ntohs(begin_request->role), 1);
+				CHECK_EQ(begin_request->Role(), 1);
+
+				request_.reset(new FastCGIRequest(header->RequestId(), this));
 			}
 			break;
 
 		  case 4:
 		    {
-				const auto *params = buf_.Read(header->ContentLength());
+				ConstBuffer param_buf(buf_.Read(header->ContentLength()), header->ContentLength());
+				while (param_buf.ReadMaxLen() > 0) {
+					const auto *param_header = param_buf.ReadObj<fcgi_param_header>();
+					std::string_view key(param_buf.Read(param_header->key_length), param_header->key_length);
+					std::string_view value(param_buf.Read(param_header->value_length), param_header->value_length);
+					request_->AddParam(key, value);
+				}
 			}
 			break;
+
+		  case 5:
+		  	{
+				if (header->ContentLength() == 0) {
+					// Magic signal for completed request (mirrors the HTTP/1.1 protocol)
+					callback_(std::move(request_));
+				} else {
+					std::string_view in(buf_.Read(header->ContentLength()), header->ContentLength());
+					request_->AddIn(in);
+				}
+			}
 		}
 
 		CHECK(buf_.Discard(header->padding_length));